Definition of M.S. noun from the Oxford Advanced American Dictionary

 

M.S.

 noun
(also MS)noun
NAmE//ˌɛm ˈɛs//
 
 
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a second university degree in science (the abbreviation for“Master of Science”) to have/do an M.S. J Stevens M.S.
See the Oxford Advanced Learner's Dictionary entry: M.S.